Definite Time Overcurrent (50N); Inverse Time Overcurrent (51N) - Siemens 7SR18 Solkor Manual

7SR18 Commissioning & Maintenance Guide
3.5.1
D T
EFINITE IME
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Check correct indication, trip output, alarm contacts, waveform record.
Note that these elements can be set to directional.
Phase Dir Is
(A)
E
3.5.2
I T
NVERSE IME
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times.
P.U. / Ph. Dir
D.O.
&
TIMING
E
TESTS
Calculated Timing values in seconds for TM =1.0
Curve
IEC-NI
IEC-VI
IEC-EI
IEC-LTI
ANSI-MI
ANSI-VI
ANSI-EI
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
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O (50N)
VERCURRENT
DTL P.U. Current
(s) (A)
O (51N)
VERCURRENT
Char. Is TM
(NI EI VI LTI, (A)
DTL)
2 xIs
10.03
13.50
26.67
120.00
3.80
7.03
9.52
Operate Time
2 x Is
Operate Current
P.U. D.O. Tol
(A) (A)
©2018 Siemens Protection Devices Limited
NOTES
Operate Time
2 x Is 5 x Is Tol
(s) (s)
5 xIs
4.28
3.38
3.33
30.00
1.69
1.31
1.30